Behind the hope that computers can replace teachers is the idea that the student’s understanding of the subject being taught consists in knowing facts and rules, the job of a teacher being to make the facts and rules explicit and convey them to the student, either by practice drills or by coaching. ██ ████ ████ ██████ ███ ███ ███ ████ ██████ ███ ███████ █████ ████████ █████ ███ █████ ██ ███ █████████ █████ █████ ███████ ███ ███████ ██ ███████████ ███ ██████ ███ █████ █████████████ ████ ███ ███████ ██████ ██ ███████ █████ ███ ██████ ███ ██ ███ █████ ██ ███ ███████ ████████ ██████████ █████ ███ ████ ████ ███ ████████ ████ ██████████ ███████ ███ ███████ ██ █████████████ ██████████